JPS6328134A - Air cooling type transmitter - Google Patents

Abstract

PURPOSE:To enable actuation up to a steady operation state without requiring any external preheater by allowing an electron tube to heat itself by increasing gradually a voltage applied to the electron tube. CONSTITUTION:When a temperature sensor 5 detects low temperature at the time of actuation, a damper 10 is switched to drive an air blower 2 so that the air in a storage container 7 is sent through an air duct 3 to cool the electron tube 1 and then discharged in to the storage container again. At the same time, a variable output type electron tube power source 6 is driven reducing the output voltage to zero and increases the output voltage gradually. In this case, when the electron tube 1 is a traveling wave tube, the anode electrode voltage is controlled and when a klystron tube, a beam voltage is controlled so as to increase gradually from 0. The output voltage of a power source 6 is increased gradually while the suction temperature is monitored by a temperature sensor 5 until loads enter an all load state successively, and the actuation of the device is completed. Consequently, hot exhaust air which is obtained by cooling the electron tube 1 is left in the storage container 7 at the time of the gradual increase in the output voltage of the power source 6 and the actuation is performed without any external heater.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air-cooled transmitter using an electron tube, and particularly to an air-cooled transmitter installed outdoors in a cold region.

[Conventional technology]

FIG. 2 is a block diagram of a conventional air-cooled transmitter. In FIG. 0, an electron tube 1 and an electron tube power source 6 for supplying electric power to the electron tube 1 are provided in a storage container 7. Air taken in from the outside through an air duct 3 to which a blower 2 is attached cools the electron tube 1 and then is exhausted to the outside again.

Furthermore, an external heater 8 is provided on the intake side of the air duct 3 to preheat the device and the electron tube body when starting up in a cold region. After that, the device was started and the electron tube 1 was operated. For this reason, a signal is received from the temperature sensor 5 provided in the air duct 3, and the external heater 8
A heater control circuit 9 was provided for controlling.

In FIG. 2, to start the device at a low temperature, the blower 2 is started, and when the temperature sensor 5 detects that the intake air is low temperature, the heater control circuit 9 energizes the external heater 8, and the temperature detected by the temperature sensor 5 increases. When the set temperature is reached, the external heater 8
The current is cut off, the electron tube power supply 6 is started, and the electron tube 1
starts operating in steady state.

For preheating when starting up at such low temperatures, the magnetomotive force of the beam focusing permanent magnet of a power amplifying electron tube such as a traveling wave tube or klystron changes depending on the temperature, and it is started by applying a full-load electrode voltage. This is because it is impossible.

[Problems to be Solved by the Invention] The conventional air-cooled transmitter described above requires a special external heater 8 and a control circuit 9 to open and close the heater 8 to start up at low temperatures, so it is not economical. This is disadvantageous in terms of making the device smaller and lighter. In addition, an external heater 8 in which a large-sized heater is used
It can be said that the reliability of the system is also not sufficient.

[Means for solving problems]

The air-cooled transmitting device of the present invention includes an accommodation container, an electron tube housed in the accommodation container, an intake side air duct that sends air to cool the electron tube, and an exhaust side that sends air that has cooled the electron tube. an air duct; an intake damper that switches the intake port of the intake air duct to either inside or outside the storage container; and an air intake damper that switches the intake port of the intake air duct to either the inside or outside of the storage container; an exhaust side damper to be switched, a temperature sensor that detects the temperature inside the storage container, a damper controller that receives a signal from the temperature sensor and controls the intake side damper and the exhaust side damper, and supplies power to the electron tube. a variable output voltage type electron tube power supply, and when activated, the damper controller controls the intake damper and the The variable output electron tube power supply is characterized in that the output voltage is gradually increased by switching the exhaust damper.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
1 is an electron tube, 2 is a blower for cooling the electron tube, 3 is an air duct, 10 is a damper that switches whether the exhaust port and intake port of the air duct 3 are inside or outside the storage container 7, 4
5 is a damper controller, 5 is a temperature sensor, 6 is a variable output electron tube power source, and 7 is a container that accommodates this device.

When starting up this embodiment, when the temperature sensor 5 detects a low temperature, the damper 10 is switched so that the air inside the storage container 7 is sent through the air duct 3 to cool the electron tube 1 and then exhausted back into the storage container. to drive the blower 2. At the same time, the variable output electron tube power supply 6 is started with the output voltage reduced to zero, and the output voltage is gradually increased. At this time, if the electron tube 1 is a traveling wave tube, the anode electrode voltage is controlled,
In the case of a klystron, the beam voltage is controlled to gradually increase from 0.

The output voltage of the power supply 6 is gradually increased while monitoring the temperature sensor 5 and the intake air temperature τ' until the load reaches the full load state, and the startup of the device is completed. When the output voltage of the power supply 6 is gradually increased, the hot exhaust gas that has cooled the electron tube 1 accumulates in the storage container 7, and the present embodiment can be activated without an external heater.

After startup, the temperature detected by the temperature sensor 5 is compared with the set temperature, and the damper 10 is controlled by the damper controller 4 to maintain the temperature inside the storage container 7 at the set temperature (the temperature detected by the temperature sensor 5 is the set temperature). If the temperature is higher than that, outside air is taken into the air duct 3 to cool the electron tube 1).

[Effects of the Invention] As explained above, the present invention gradually increases the voltage applied to the electron tube and uses the heat generated by the electron tube itself to start up the tube in steady state driving without the need for an external preheating heater. things are possible. Furthermore, steady operation condition! After reaching ε, the heat generated by the electron tube is used 12, and the temperature of the entire device housing container can be easily controlled.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional air-cooled transmitter. DESCRIPTION OF SYMBOLS 1...Electron tube, 2...Blower, 3...Air duct, l...Damper controller, 5...Temperature sensor, 6
...Variable output electron tube power source, 7...Accommodation container, 10...Damper.

Claims (1)

[Claims] A storage container, an electron tube housed in the storage container, an intake side air duct that sends air for cooling the electron tube, an exhaust side air duct that sends air that has cooled the electron tube, and the intake side air duct. an intake-side damper that switches the intake port of the air duct to either inside or outside of the storage container; an exhaust-side damper that switches the exhaust port of the exhaust-side air duct to either the inside or outside of the storage container; and the storage container. a damper controller that receives a signal from the temperature sensor and controls the intake side damper and the exhaust side damper; and a variable output voltage type electron tube power supply that supplies power to the electron tube. At startup, the damper controller switches the intake side damper and the exhaust side damper so that the intake port of the intake side air duct and the exhaust port of the exhaust side air duct are inside the storage container, and also switches the output side damper. The modified electron tube power supply is an air-cooled transmitter that gradually increases the output voltage.